Toxic Mine Leak Turns Mexico River Orange

Sonora state, which accounts for 27 percent of all Mexican mining, is the country's leading producer of gold, copper, graphite and a number of other mined products.

In August last year, a trailer-truck carrying cyanide for a Sonora gold and sliver mine overturned, contaminating the Yaqui River. This caused a shortage of drinking water, human illness and the death of reptiles and birds.
http://www.ndtv.com/article/world/toxic-mine-leak-turns-mexico-river-orange-573867